Cutter for extruding machines



March 7, 1933. c DESAUTELS 1,900,434

CUTTER FOR EXTRUDING MACHINES Filed April 15, 1929 3 Sheets-Sheet 3 1 N VEN TOR.

C'h ar/es ,HZ Des'aufe/s.

ATTORNEY.

Patented Mar. 7, 1933 1 UNITED S MASSACHUSETTS y r Application fil'ed Apri11 5i,

. ing 'Inachine particularly adapted to break up 5 and plasticize;cruderubber' preparatory to milling operations. It has among its objects to provide a cutter which utilizes the outwardpush' of the extruded stock to aid in the cutting. operation. Another object is to provide 10 a cutter which does not have to be" reset. for every cutting. A still further object, is to provide a cutter which will beoperated automatically in synchronism with the extruding -machine so as to cut oil the stock in predeq termined lengths. Further objects will be apparent in the following specification and claims.

In the drawings which illustrate one em -bodinient of my invention,

20 Figil is a front view of a compound extru'ding 7 machine or plasticator upon; which has been mounted an automatic; cutter. em-

bodying my invention;

Fig. 1, but on a larger scale; it V Fig. Sis a view similar to Fig. showing the position of partson the next cut from those shown inFig.-2;

Fig. 4 is a sectional v ew taken on "the line. 4.@ of Fig. 2', but on a smaller scale;

Fig. 5 is a sectional view taken on the line] type. The head, 11 serves to form a bearing for shaft 12' of the upper feed screw and 13 Fig. 2 is a view taken on. the line off messaonusnrrs, ASSIGNOB, RUBBER COMPANY, or cnrcornn FALLS, MASSACHUSETTS, A G RPQ cur'rnnfron EXTBUDING IVLFALGHINES" 1929. Srial No. 355.168.

is w en m a re fo ming-die bi ale lowerfee'd screw. The crude rubher l iis fed to the upper feed screw which forces the:

stock backward in the machine, then delivers 1t to the lower feed screw which in turn PATENTsomei CHARLESH. IDESAUTELS; OF SPRINGFIELD,

forces thestock forward through the-forming die to form a tube 15'. Since-this part of the machine is of standard-construction and in itself forms no part of my inventionfurther description is believed unnecessary. I g

ter comprising a box-shaped-frame 16 bolted tothe head ,13, A pair of doiib-le edged.

knives 17 are secured to shafts 17 mummy mounted. in the frame 16and. meshing gears As best shown' in .Fig. 5,

hen the knives,

are in rest position they are parallel; to the stock and baflle plates-19 formed'in the frame,

16 serve to prevent the leading. edge of' the tube 15 from engaging withthe knives when in this position. When a rotative force is applied (by means'to be later described) to either of the cutters in the direction of the] arrows they will bight into, the. tube 15; and: as thelatter continues to move forward, as

indicated by the arrow. the tube 151willflex ert a pressureflon the back of the knives in 1 addition to the applied force until the'knives reach the positionshown in Fig. 6 when the cutting iscompleted. Then the knives continue to rotate until ,theyhave' described anarc of 180 when they will be in the same positionas shown in Fig. 5 only the cutting been found that very little force needbe. applied," the forward 'movement of the tube edges will be reversed. In practice it has 1 15 being of such force that the latter will literally cut itself.

Referring to Figs.

1 to l inclusive, Iihave shown ,onemethod of mechanically imparting an intermittent rotative force in' one di- 55 For "handling purposes; it is customary practice to' cut this tube 15 into short lengths and to do thisl have provided a novel cut-' 2. It can readily be seenthat for each stroke 5 .the one to one same size as gear 20. These gears are rotatably mounted on stud shafts 23 and 24 secured in theframe 16. Segmental gears 25 and 26 are also rotatably mounted on the stud shafts and are locked respectively to the gears 21 and 22. A bridge member 27 bolted to the stud shafts23 and 24 is formed to guide a slide 28 secured toa piston rod 29 of a two-way cylinder 30 which is secured a similar rack 34 and stops 35 and 36 are bolted to the other side. These racks 31 and 34 are positioned to, respectively, engage the gear segments 25 and 2 r Referring to Fig. 2 I haveshown the position of parts at the ends of theinward stroke of the two-waycylinder 30, as indicated by the arrows. It is evident that the stop is -..engaging the gear segment 25 to rotate it n the direction of the arrow, but the gear segment 26 is acting through gears 21. 20 and 22 to hold 'back the stop '35. thus the parts are in a locked position. .L. applied t'o'thecylinder by means to be later described, to reverse its stroke'the rack 34 engages the segment 26 and the segment 25 will be rotated through the gears22, 20 and N 21 away from the rack 31. This'movement iacontinues untilthe stops 33 and 36 engage the segments 25 and 26, when the apparatus will again be in locked position, as shown in V Fig.v 3. When the stroke of the cylinder is again reversed the movements will be repeatgsed except that this timethe segment 25 will be inengagement with therack31 while the segment 26 moves away from the rack 34 and on the end of the stroke the parts will be again in the position shown in Fig. 2. f a

of the cylinder the segments 25 and 26 will be rotated 180 the gears 21, 20' and 22 are of a one to one ratio the gear 20 will be rotated 180 in the sopposite direction, asrindicat'ed by the ar-' rows. Thus the knife 17 and knife sh aft 17, to which the gear 20 is splined,-will be rotated 180 for each stroke of the cylinder and also the other knife 17 acting through site direction. The locked positions of the .parts correspond to the positions ofthe knives, as shown in Fig. 5, so that at each stroke of the cylinder 30 the knives will perfiQ \form a cutting as previously described. 7'

The two-way cylinder may be actuated by a suitable manually operated valve of any standard des gn connected in the power supply line, but I prefer to do this automatical- 5 1 in synchroni'sm with the machine, as in to the frame 16. A rack 31 and stops 32and 33 are boltedto one side of the sl de 28'while When power is in the same direction and as ratio gears 18 but in the oppoe.

so doing pieces of tubing of equal determinate lengths may be out without the necessity of an operator.

To accomplish this I have provided a standard valve 37 secured to the upper head 11 and connected tothe two-way cylinder 30 by connections 38 and 39 so that by pivoting the operating lever 40 compressed air may be alternately introduced from a supply line 41 into the connections 38 and 39. A roller 42 is mounted on the lever 40 and is held in engagement with a cam 43 by a spring 44. The cam 43. is secured to a ratchet wheel 45 mounted so as to be freely rotatable on a shaft 46 secured to the head 11. A bell crank v 47 is also rotatably mounted on the shaft 46 and onone arm; is mounted a' pawl 48 positioned 'tocengage the ratchet wheel 45. A spring49 holdsthe bell crank against a stop 50 when in rest position and a stationary idler pawl 51 is provided to make the pawl action positive. The other arm of the bellcrank 47 is positioned to: engage a collar 52 eccentrically mounted to the constantly rotating shaft 12 of the upper feed screw. As the shaft 12 revolves the collar 52 engaging with the bell crank 47 will cause the pawl 48 to index the ratchet wheel 45 and the at- I tached cam 43, thus operating the valve 37. Various length cuts may be accomplished by changing the shape of the cam 43-or by adjusting the eccentric mounting of thecollar 52, thus controlling the number of teeth indexed by the pawl 48 per revolution of the shaft 12.

In Figs. 7 and have shown a cutter of.

modified form which is adapted to be operated manually. A hand wheel 53 is splined to one of the knife shafts anda sliding key 54 operated by a spring-pressed lever 55 engages in grooves formed inthe hub of oneof the gears 18 to lock the knives in the position shown in Fig. 5 when the apparatus is inoperative. l I V v Having thus described my invention, I claim: i

1. A device of the character described comprising a pair of rotatably mounted double- 7 edged cutters, a pair of equal gears splined to the cutter shafts and meshing with each other, means for releasably locking the knives against rotation at 'two positions 180.apart and means operable to rotate one of the knives. 1 I I a 2. The combination comprising a rubber extruding machine, a pair of rotatably mounted double-edgedcutters adjacent the extruding die of the machine and so positioned that the product passes between them and means'operable to rotate the knives in the direction of the feed of the product to en gage their cutting edges in the product and to present the back'surface; of the knives to the advancing product to be engaged there by to aid, in the rotating of the knives.

3. The combination comprising a rubber extruding machine, a pair of rotatably mounted double-edged cutters positioned adj acent the die of said rubber extruding machine so that the extruded product will pass between them, a gear secured to each of the cutter shafts and meshing with'each other and means operable to automatically rotate one of the cutters intermittently in 180 arcs in one direction and in predetermined timed relation with the extruding machine.

CHARLES H. DESAUTELS. 

